Year	years
2003	2.75
2004	2.75
2005	2.68
2006	2.6375
2007	2.6375
2008	2.6375
2009	2.6
2010	2.358823529411765
2011	2.358823529411765
2012	2.164705882352941
2013	2.152941176470588
2014	2.152941176470588
2015	2.223529411764706
2016	2.1176470588235294
2017	2.1470588235294117
2018	2.1470588235294117
2019	2.1470588235294117